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Convert WebM to MKV
Convert WebM to MKV format — 100% browser-based, no upload required.
2 cores · low tier
Drop a file here or click to select
Format will be auto-detected
About these formats
Source
WebM
Web MediaOpen-source video format by Google using VP8/VP9 video and Vorbis/Opus audio. Optimized for web delivery and HTML5 video.
Best for
Web videoHTML5 videoOpen-source projectsWebRTC
Advantages
- + Royalty-free
- + Good VP9 compression
- + Web-optimized
- + Opus audio
Limitations
- − Limited device support
- − Slower VP9 encoding
- − No older iOS support
Target
MKV
Matroska VideoOpen-source container that can hold many video, audio, and subtitle tracks. Popular for high-quality video archiving and media libraries.
Best for
Video archivingMulti-track contentSubtitlesMedia libraries
Advantages
- + Open source
- + Any codec
- + Multiple tracks
- + Chapters & subtitles
Limitations
- − No native browser support
- − Not streamable
- − Limited mobile support